Losing all strength. Is it because of cardio?

I used to just lift and do martial arts (which was pretty light). I also was eating without counting cals, and my weight stayed the same. That was a year and a half ago.

About a year ago I started counting cals for wrestling. I also had to cut tons of weight. Needless to say, I lost a lot of strength, but during wrestling season I always do, and then gain all of it afterwards, sometimes even more. After three months, the season was done, and I started my normal exercise routine again and regained my weight. I lift and do martial arts like before, but have also started running, four times a week, about 15 miles total (30 min each time). I also walk around campus to class a lot, whereas before I was in high school so i never was that active except for my exercise. I eat about 2400cals a day and 200g protein.

Well, I've gotten soooo weak in regards to how much I can lift. For example, I was able to bench 170lbs 10 times, and now only 6times. My max was 220lbs and now its 200lbs. I thought i was just having a bad month, but its been more than a year that i havent been able to get back to how strong I was. Thing is, I weight 145 now, and was 140 back then, but stronger. 

WHY?! I should be stronger, as I weigh more (unless i gained fat, but now i do cardio, which i didnt before, so i should be even leaner right?). Is it due to the cardio. I now that cardio can affect weight gain, but i dont wanna gain weight, just strength. HELP!!!

just because you gained weight back doesn't mean your strength will come back as fast.  your protein intake seem more than sufficient.  why type of foods are you eating, along with a lot of protein you need healthy carbs.  if you're just pigging out on stuff getting to 2400 calories a day that won't do much for you.  losing a lot and then trying to gain it back pretty quick can take a toll on the body itself.  cardio shouldn't hurt your training unless you're doing cardio before you lift and if you run as much as you say you do your body is probably tired all ready so you don't have as much energy in the weight room as you do on the track.  i wouldn't worry too much though, sometimes it just takes a while to get back to full strength, just make sure you eat right and rest plenty you should be back to your old self soon.  personal favorite weightlifting chow for me is broccoli, it's full of zinc, potassium, vitamin b, and fiber.  have that with some chicken breast and brown rice always make for a good meal for energy if that will help in the weightroom.

well, the thing is, i started back this routine when wrestling ended, over a year and a half ago, and ive havent regained the strength since b4 the season. So idk if waiting will help, since ive waited so long.

Most of my other cals are good. I allow myself one snack a day, around 300cals, that is "bad" i guess. But the rest is whole grains, fruits and veggies. I LOVE broccoli i go through like 2-3 cups a day lol. I eat six meals, and have a 40g protein shake after lifting. I run after i lift too (on most days) so i dont think thats it. Plus i take creatine (but i did that b4 i lost the stregth too).

 Mmm, yes - when gaining muscle, keep total cardio to under 90 minutes a week.

 Post-cardio your body activates the AMPK hormonal system responsible for cellular energy regeneration to restore the energy reserves you just expended, which switches off all other energy-intensive processes. This includes the mTOR-based protein synthesis responsible for muscle growth, which would otherwise compete with the restoration of muscle glycogen and ATP/phospacreatine to pre-workout levels.

 There's a workaround, you can get really anal-retentive about getting in some liquid calories at 0,2,4, and 6 hours post-cardio (with carbs/protein in a 4:1 ratio) and a total protein goal of around 12-14g per hit. Chocolate milk tends to work well for this as long as you lay off the HFCS-sweetened ones. (No, HFCS isn't dangerous, it just doesn't elicit quite the insulin response you're looking for here.)

 Or you could just drop one run or cut 10 minutes off each so you'd come in at 4x20=80 minutes a week and not have to mess about with having to drink chocolate milk every two hours. It sounds good in theory, but belive me, at around week two you start to burn out on it.

 200g of protein is actually a bit much - at 145lbs or 65kg you need (65*1.8g/kg d=)117g protein per day which is the max your body can process to form new muscle. It's not dangerous to go over that, but it's not beneficial either; there's no point in cramming down another 50-80g over what your body can use to actually build new muscle. Yeah, you might want to leave a little margin of error and some room to grow instead of trying to balance on the edge, but you're getting about 70% more than you need which is kinda far outside of "margin of error" territory ;)

 Hit up the fresh veggies and good fats for the rest of your energy needs- including some saturated fat. Your body needs it to produce testosterone, so without some dietary saturated fat you're also limiting your results unnecesarily.

Cardio should never reduce your energy.  If anything, it should do the opposite.  I suspect that you are eating too few calories for your age/weight/fitness regeme. 

You also want to be taking enough rest days. Your muscles actually only gain strength when resting and rebuilding, so be sure to give enough recovery and perhaps ease off every 4th week or so to prevent over training.

Well I'm not actually looking to build muscle, just gain strength without bulking. Like I want to get to the strength I was before, even though I had the same muscle content and weighed the same.

Btw, how many calories do you think I should be getting, to maintain?